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Author Topic: Threading  (Read 1436 times)

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Threading
« on: July 08, 2012, 09:56:36 PM »
Im trying to understand how its possible to cut threads without stopping the spindle.

The x feed rate and spindle rpm must be related and then you just pull out of the cut
go back to start, feed in a little bit more and your good to go?
How do you know your starting the next run at the same place the thread started.

Right now, Im doing a controlled number of  revolutions stop the spindle  reverse and retract out the same way.
Feed in some more and redo.

Thanks

Offline RICH

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Re: Threading
« Reply #1 on: July 08, 2012, 10:19:10 PM »
JOHN,
Mach's CNC threading cycle is described in Threading On  the Lathe  which can be found in Members Docs.

RICH

Offline Hood

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Re: Threading
« Reply #2 on: July 09, 2012, 10:44:20 AM »
Single point threading with a CNC lathe is just like threading with a manual lathe in the respect that the spindle doesnt stop  between passes, there is no need as the only thing that needs to be in sync is the Z axis to the spindle speed. On a conventional lathe that is achieved by mechanical gearing and engaging the half nut at the correct time at the start of each pass. On a CNC lathe the controller does that by watching the Index pulse and starting the Z axis at the correct time.
Hood